I'm getting ready to build an enclosed pen/aviary type setup for my call ducks. I'm making it 16'x16' square and 6' tall. It will be framed with pressure treated 2x4's and wrapped in 14 gauge 1"x 2" poly coated galvanized wire, including the overhead. I have one of those plastic koi ponds that will be the centerpiece. I'd like to keep it natural looking, but easily maintainable. I plan on using about 6-8" of stone as a base for drainage. Does anyone have any pictures or suggestions before I spend a lot of time doing something that I shouldn't have?